Bryant



(NoMoael.)

0. F. DOEBLER 81C. K. BRYANT. KNOB ATTACHMENT. N0. 503,203.

Patented Aug. 15, 1893.

' Inveaom: (lloebler, QZrJ/anzj UNITED STATES PATENT OFFICE.

CHARLES F. DOEBLER AND CHARLES K. BRYANT, OF HARTFORD;

CONNECTICUT.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 503,203, dated August 15, 1893.

Application filed March 6, 1.893. Serial No, 464,680. (No model.)

To all whom it may concern.-

Be it known that we, CHARLES F. DOEBLER and CHARLES K. BRYANT, citizens of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Knob Attachments, of which the following is a specification.

This invention relates to that class of knobattachments commonly known as screwless knobs, the object being to provide a knobattachment of that class which may be readily removed and replaced without requiring adjustment to the thickness of the door,'and which shall at the same time be simple and eiective in operation.

In the drawings accompanying and forming a part of this specification, Figure 1 is a sectional elevation of a knob-attachment embodying our present improvements. Fig. 2 is 'a plan view of the adjacent ends of the knobsteins, together with the means for connecting the same. Fig. 3 is a similar view of the removable end or coupling of one of the knobstems. Fig. 4 is a similar view of the stem fitting said coupling. Fig. 5 is a view similar to a portion of Fig. 1, illustrating a modification in the construction of the improvement. Fig. 6 is a cross-sectional view, in line d a, Fig. 5. Fig. 7 is an end View of one of the knob-stems. Y 't Similar characters designate like parts in all the iigures.

In Fig. 1, B represents a portion of an ordinary door having therein the lock-case C furnished with the usual cam or hub D for actu` ating the mechanism of the lock. The hub D of the lock (or the part of the lock corresponding to the hub usually employed) is provided with two knobs, K and L, one on either side of the door `B and connected with the lock mechanism through the usual knob-stems, 5 a-nd 6, of said knobs respectively. According to our present improvements, said knob-stems connect with the hub D (or other part corresponding thereto) by means of suitable tenons or shapes formed on the adjacent ends of the knob-stems, as will beY understood more clearly bycomparison of the several iigures of drawings.

`One of the knob-stems, 5, shown at the lefthand in Figs. 1, 2 and 5, is formed at the righthand end thereof with the squared end or tenon 2, which fits into one end of the correspendingl bore of the hub D. The opposite knob-stem, 6, shown at the right-hand in Figs. 1, 2, 3 and 4, is of a composite construction, being formed of two parts adapted to be engaged with and disengaged from each other. The removable part, designated in a general way by E, is formed at the inner end thereof at 3 to constitute a tenon similar to the aforesaidl tenon 2 of the opposite knob-stem 5. Said removable part E is in the nature of a coupling, and is or may be joined to the opposite knob-stem 5 by means of a screw or like connection, as 15, passing through said coupling and engaging a corresponding thread formed in said stem 5. The outer end of said coupling E is constructed for engagement and disengagement with and from the correspondingly-constructed inner end of the detachable knob-stem 6. The preferred construction of the parts for accomplishing this purpose is the tongue-and-groove device shown in the drawings; this consists or may consist of the T-slot 16 (see Fig. 3) formed in the coupling, and the T-shaped end 17 (see Fig. 4) formed on the knob-stem 6. Said knob-stem 6,when constructed as described, is readily attachable and detachable with and from the coupling by sliding the same (when in the position shown in solid lines in Fig. 1) laterally of the coupling, toward or from the same, as the case may be. When said T- shaped end of the knob-stein 6 is in the T- slot 16, as shown in Figs. 1 and 2, it stands contiguous to the head, 18, of said coupling-screw 15, and thus serves to prevent the screw from being turned out. For obtaining greater security in this respect, in some cases we form in the end of the knobstem 6 the groove 20, Figs. 5 and 6, and form the head of the screw of an oblong shape, as shown in Fig. 6, to enter the said groove and thus be locked against rotation.

For the purpose of furnishing the required bearings or guides for the knob-stems 5 and 6, these are provided with the bearing-plates 4 and 14 secured to the door by aseries of screws, 21, in the usual manner. The bearing-plate 14, supporting the knob-stem 6, covers a recess, 22, formed in the door immediately above the juncture of said stem with the aforesaid coupling E, as illustrated in Fig. l. By detaching said bearing-plate from the door, this plate, together with the stem 6 journaled therein, may be slid upward, as illustrated by dotted lines in Fig. 1, and the stem thereby detached from the coupling and removed from the door. This gives access to thescrew 1S, which being unscrewed, the coupling and the opposite knob-stem may be removed from the lock.

In using the improved knob-attachment, the door having been suitably prepared therefor and the lock put in place in said door, the knob-stem 5 is placed in position on one side of the hub D, and the coupling E is placed in position on the opposite side of said hub, as

illustrated in Fig. 1. The screw 15 is then put in place, to close the stem and coupling against the hub 5 after which, the knob-stem G with the bearing-plate 14 thereon, is put into the recess 22, as shown in dotted lines in Fig. 1, and then slipped down into engagement with the coupling, as shown in solid lines in said figure. Next, the bearing-plates are secured to the door, when the apparatus is ready for operation.

Having thus described our invention, we claim- 1. A knob-attachment comprising a lockactuating hub having an angular recess, an internally screw-threaded knob-stem tting said recess at one end, a coupling having a stem at one end litting said hub recess and having tongues and grooves at its opposite end, a screw engaging said coupling and knobstem, and a knob-siem having tongues and grooves at its end for engagement with the tongues and grooves of the coupling, and,

when in engagement, abutting against the head oi' the screw to prevent turning thereof, substantially as described.

2. In a knob-attachment, the combination With the angularly recessed lock-actuating hub, of the internally screw-threaded knobstern fitting the hub recess at one end, the centrally bored coupling engaging said hub and having its end face grooved transversely to receive a longitudinal projection upon an adjacent knob-stem, a screw engaging the internally threaded knob-stem and coupling and having an elongated or angular head, and a knob-stem having longitudinal projections to engage the coupling and embrace the screwhead, whereby the parts are locked together and the screw prevented from turning, substantially as described.

3. The combination with the door B recessed at 22 at one side, as described, and having the usual lock-receiving mortise and transverse knob-stem openings, ofthe lock-actuating hub having the angular recess, the knob-sten1 5 fitted in said recess at one end, the coupling E secured to said knob-stein by a screw and bearing against the hub and having the tongues and grooves in its end face as described, the knob-stem G having tongues and grooves at its end to engage the coupling and head of the screw, and the bearing-plate 14 engaging the knob-stem and covering the recess 22 in the door, al1 substantially as and for the purpose described.

CHAS. F. DOEBLER. CHARLES K. BRYANT.

Witnesses:

HANS MALLNER, HENRY L. RECKARD. 

